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G. W. BAIRD. STEAM GENERATOR 0R EVAPORATOR.

No. 417,803. Patented Dec. 24, .1889.

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UN TED STATES PATENT @FFICE.

STEAM GENERATOR OR EVAPORATOR.

SPECIFICATION forming part of Letters Patent No. 417,803, dated December24, 1889.

Application filed September 3, 1839. Serial No. 322,814. (No model.) I

To ctZLwhom it may concern.-

Be it known that l, GEORGE \V. BAIRD, an engineer officer in the Navy ofthe United States, a citizen of the United States, residing atWashington, in the District of Columbia, have invented certain new anduseful Improvements in Steam Generators or Evaporators for Making Pureater for Feeding Boilers, for Drin kin g, and for Culinary and for otherPurposes, of which the following is a specification.

The principal object of my invention is to supply pure water forstealnboilers, for drinking purposes, &c.; and it is an improvement onmy device shown in my patent of August 23, 1887, No. 368,642, in which asteam-pump was used to feed the generator, separate blow and feed pipeswere provided, and a salinometer was necessary.

In the present invention the generator is designed for small vesselssuchas steam launchesand is composed of a very few' parts, and is easilymanipulated.

The invention consists in the construction and arrangement of the twococks, one in the pipe leading from the top of the generator to thecondenser and the other in a pipe lead ing from the bottom of the sameto the sea, whereby, on a certain movement of a rod connected withthehandles of the cocks, the water may be drawn in, the water blown out,or

the steam admitted to the condenser, to be condensed and pumped into theboiler.

It also consists in attaching the glass watergage pipes to the top andbottom of the gen erator.

Figure l is a vertical section of my genera- Fig. 2 is a top planshowing the diiferent positions to which the handle of the cock ismoved, and Fig. 3 is a section of one of the cocks.

A is the shell, which is made of any suitable metal and having both endsflanged to receive the cast-iron heads B and B. These heads are similarin construction, each having passages 11 and Z) cast into them, intowhich the ends of the cocks G and C are screwed.

From the cock 0 leads a pipe 0 to a condenser, and from the cock C leadsa pipe 0 to the water-supply. The cocks are operated of thesocket-wrenches E and E. The wrench E is placed on the cock 0, and thelever D is placed on the head of the wrench. The head of the wrench E isslipped into the square opening of the lever. The socket of the wrenchis then slipped up over the square on the socket C and held in thisposition by the setscrew 6. Through the upper head enters the steam-pipeF, which passes down into the shell, where it forms a coil G. The end ofthe coil terminates in a straight pipe H, that passes through the bottomhead 'and is provided with a valve h. The steam-pipe is also providedwith a valve F. The coil and steampipe are held in place and to thebeads by the nuts i and i.

I is a glass water-gage, which is connected to the generator by thepipes K and K, which extend around and enter the top and bottom heads.

I have found in practice that with a gage placed upon the side, as inordinary boilers, the height of water was not correctly indi cated,owing to the violent ebullition. By placing the connections of the gagesas I have described the difficulty has been entirely overcome. 111 thebottom head is placed a drain cock and pipe L to drain the water fromthe generator when desired.

The cocks, as shown in Fig. 3, are so arranged with relation to eachother that when the lever D is in the position shown in Fig. 2 the uppercock is open to the condenser and the lower cock is closed. It isunderstood that the steam has been admitted from the main boiler throughthe pipe F to the coil. The cocks remain in this position until thewater has been evaporated down to a predetermed. point in the generator,usually determined by the bottom of the glass, which indicates thesaturation or densityof the water, at which time the lever is turned toposition 3, (shown in dotted lines,)which position closes the upper cockand opens the lower cock. A pressure of steam is then generated,- whichblows the remaining water out. The lever is now turned to position 2,which opens the upper cock, placing the generator in communication withthe condenser and the sea, when the vacuum draws in the water, and whenthe height of water reaches a pre determined point the lever is moved toposition 1 again, when vaporization again takes 1 place. The generatoror evaporator is so proportioned that if the normal sea-water beusedthat is, sea-water containing about one thirtysecond part of saline1natterand if vaporization be commenced when the gageglass is full andcontinued until the gageg'lass be just emptied, the density of theremaining water will be about six thirty-see onds. Though I usuallyconstruct the evaporators of these proportions, I do not confine myselfto the exact proportions. The object ofplacing the limits and indicatingthem by the terminals of the gage-glass or by marks on the gage-glass isto obviate the necessity of a salinometer to enable a man unskilled inthe art of measuring densities of fluids to effectively operate mygenerator.

The valve 11, leading from the coils, is opened when the machine is inuse, and a steam-trap (not shown) keeps the steampressure in the coiland permits the condensed water to escape to the hot-well or feed-tank.No Water is therefore lost.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. In a steamgenerator or evaporator, the combination of the shellwiththe steam-coil, the steam-discharge cook, the blow-01f and feed cock,and means for operating the cocks simultaneously, substantially as shownand described.

2. In a steam generator or evaporator, the combination of the shell withthe steam-coil, the steam-discharge cook, the blow-off and feed cook,the socket-wrenches, and the lever for simultaneously operating them andthe cocks, substantially as shown and described.

3. In a steam generator or evaporator, the combination of the shell andits head with the water-gage connected to the generator at its endsthrough the heads, substantially as shown and described.

4. In a steam generator or evaporator, the combination of the two cockswith the wrenches, andthe lever for operating and holding the wrenchesin position, substantially as and for the purpose described.

